Chemical Modifications of Cassava Peel as Adsorbent Material for Metals Ions from Wastewater
| Autor: | Affonso Celso Gonçalves, Marcelo Angelo Campagnolo, Douglas C. Dragunski, Eduardo Ariel Völz Leismann, Gustavo Ferreira Coelho, Daniel Schwantes, César Ricardo Teixeira Tarley, Alisson Junior Miola |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
021110 strategic
defence & security studies Langmuir Chromatography Article Subject Chemistry Metal ions in aqueous solution 0211 other engineering and technologies Langmuir adsorption model Sorption 02 engineering and technology General Chemistry 010501 environmental sciences 01 natural sciences lcsh:Chemistry symbols.namesake Adsorption lcsh:QD1-999 Wastewater symbols Point of zero charge Chemical composition 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Journal of Chemistry, Vol 2016 (2016) |
| ISSN: | 2090-9063 |
| DOI: | 10.1155/2016/3694174 |
| Popis: | Residues from the processing of cassava roots (Manihot esculentaCrantz), or cassava peels, are evaluated as chemically modified adsorbents with H2O2, H2SO4, and NaOH, in the removal of metal ions Cd(II), Pb(II), and Cr(III) from contaminated water. Modified adsorbents were chemically characterized for their chemical composition andpHPZC(point of zero charge), while adsorption tests determined the best conditions of pH, adsorbent mass, and contact time between adsorbent and adsorbate in the process of removal of the metal ions. Isotherms obtained from the preliminary results were linearized by Langmuir’s and Freudlich’s models. The thermodynamic parameters, such asΔH,ΔG, andΔS, were also evaluated. The modifying solutions proposed were effective in the modification of adsorbents and resulted in high capacity sorption materials. Equilibrium time between adsorbent and adsorbate for the solutions contaminated with metals is about 40 minutes. The Langmuir model adjusted to most results, indicating monolayers adsorption of Cd(II), Pb(II), and Cr(III). The values obtained for LangmuirQmshow a higher adsorption capacity caused by chemical modifications, with values such as 19.54 mg Cd(II) per g of M. NaOH, 42.46 mg of Pb(II) per g of M. NaOH, and 43.97 mg of Cr(III) per g of M H2O2. Results showed that modified cassava peels are excellent adsorbent, renewable, high availability, and low-cost materials and a feasible alternative in the removal of metals in industries. |
| Databáze: | OpenAIRE |
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